Gas-heated hot-air furnace



l N0V 5, 1929. G. F. REzNoR -1,734,647"

GAS HEATED HOT AIR FURNACEl Filed oct. 1e. 192s 4 sheets-sheet" 1y l Nov. s, 1929. G. F. REZNORv 1,734,647

GAS HEATED HOT AIR FURNACE Filed Oct. 16, 1928 4 Sheets-Sheet 2 az L' MP, M QT/MRMM Nov. v5, 1929. G. F. REzNoR 1,734,647

GAS EATED HOT AIR FURNACE Filed OCt. 16, 1928 4 Sheets-Sheet 3 .INVENTOR Nov. 5, 1929. G. F. REzNoR 1,734,647

GAS HEATED HOT AIR FURNACE Filed oct. .16, 1928 4 sheets-snaai 4 INVENTOR wf wi/V f3 Jaw Patented Nev. 5, 1929 UNITED starts GEORGE FOSTER REZNOR, F MERCER, PENNSYLVANIA GAS-HEATED HOT-AIR FURNACE Application led October 16, 1928.

My invention relates to gas-heated hot-air furnaces of the radiator type and is a continuation in part of my application Serial Number 148,672, filed November 16, 1926.

One object of this invention is to provide for a gas-heated hot-air furnace an integral structure or unit of the radiator type in which combustion takes place and in which the burning and waste gases travel to a suitable waste-pipe connection. In practice one or more of my units are assembled in .a jacket through which air travels and in which it is heated by the said unit or units, the heated air then passing to one or more rooms for .l5 heating them.

2 0 of the cross-section of the flues connecting the combustion and vent chambers. Other objects appear hereinafter.

Referring to the accompanying dra-wlngs,

Fig. 1 is a sidey view of one of the heating l a5 units shown in my said application; Fig. 2,

a central vertical section of Fig. 1; Fig. 3,4

an end View of three units on a single base,

parts ofthe units' being broken away; Fig. 4,

a horizontal section of Fig. 1 on the line 4'4; 3 0 Fig. 5, a combined front elevation and central vert-ical section of a modified unit; Fig. 6, an end elevation of Fig. 5, a part being broken away, and Fig. 7 a horizontal section of Fig. 5 on the line 7 7. y

Referring first to Figs. 1 to 4, 10 designates one of my heating units intended to be enclosedin a jacket through which air tobe heated is passed. Such jackets are old and one is shown in my said application in combinat-ion with some of my said heating units, and form no part of the present invention. n fact my heating unit could be used without a jacket if desired; v

The unit 10 is cast in one piece and rests on suitable supports, as 11. It comprises the lower or combustion chamber 12, the upper or vent chamber 13 and the fiues 14 connecting the chambers. The combustion chamber is shown to be oblong in cross-section with ro-unded upper and lower portions and the Serial No. 312,756.

Vlow ribs 15, the ribs for each chamber 12 beign continuous fromrone side and around the bottom and to theother side. The iues 14 are extended vertically up along theksides of the chamber 13 inthe form of hollow ribs 16. Thus, the unit 10 presents a corrugated appearance. f l G5 The chamber 12 has a number of external i fins 17 surrounding it between consecutive flues 14. n

The chamber 13 has the flat metal choke plate 18lying on the bottom of the chamber to prevent the` too free or rapid'escape of the hot gases into the vent chamber 13 until mostv of the heat hasbeen given up through the part of the unit below. Y

rlhe chamber 12 contains the gas burner 7.y 19, and has at one end the flange 20 to which a door, not shown, may be attached in any suitable manner. Atvthel other end of the chamber 12 is the flange 22 to which a cover, not shown, may be applied in any suitable manner. The chamber 13 has its front open# ing for a door, not shown. The' rear of the chamber 13 has the flange 25 which is leftr open for connection to an off-take pipe` to a chimney or the like. f

Both the chambers 12 and 13 are corrugated so that expansion and contraction of the chambers isr taken care of merely yby changes in the spacing ofthe corrugations. This corrugated construction is very advantageous in a heating unit cast in one piece.

rThis construction isof material value invmak-r ing the one-piece casting practical because it withstands both the cooling strains in the foundry and the operating strains in practical use. Such construction is particularly useful with the present day full-on and dead-off automatic thermostatic control systems under which such constructions may have the fire out sufficiently longto become quite cool, fol- W5 lowed by the instantaneous turning on of the gas at maximum rate. Such corrugated one-piece heating units have no joints for escape of burned gases.

Fig. 3 shows three units 10 arranged side by side tied together by the tie-bar 26 and resting on thebase or support 11. i

In Figs. 5, 6 and 7, I show a heating unit which is substantially like that shown in Figs. 1, 2, 3 and 4, except that the fines which connect the combustion and vent chambers are divided. The same reference characters will be used as have been used on Figs. 1 to 4 for like parts. Parts in Figs. 5`to'7 which are analogens to parts in Figs. 1 to 4 but differing somewhat therefrom bear'the same reference characters as accompany Figs. 1 to 4 but provided with a prime mark.

In Figs. 5 to 7, the flues connecting the chambers 12 and 13 are divided by the space 27 which provides two flues 14 connecting each rib or corrugation 15 to corresponding pairs of ribs 16. The two iiues 14 are an improvement over the individual flues 14 for the three reasons following: first, they divide the ascending hot gases into smaller streams with less cross-area as compared with the flue circumference, thus increasing the efficiency of heat transfer' to the surroundingair and reducing the size of the stream of hot gaswhich does not touch the flue walls; second, they greatly favor the molding or casting of the unitV in one piece by doing away with the rwideV and thin one-piecesand core which is required for the oneepiece flue which is difiicult vto managegand, third, they split up the air in external contact with the unit by proi viding'a feront to back air passage betweenthe members of the divided flue.

' As the casting of a unit is necessarily molded on the side, the casting in one Vpiece which isv of considerable size is made more practical by the use of the two'sandcores for the double fiue 14 instead of one core for the single flue 14. The opening 27 vbetween the members of the double flue'14 reduces the depth of the pattern necessary to draw from the sand.

The cross-section of each member of a iiue 14 is somewhat triangular. Each member is thinner at the wall next to the space 27. vThis facilitates the drawing from the sand, and the said shape of cross-section of the flue members is equivalent to a large degree of draft which allows the surfaces of the flues 14 to come free from the sand mold readily.

I provide the sides of the flues 14 with vsmall ribs or fins 28 to facilitate the transfer of heat from the flues to the surrounding air.

It is to be noted thatthe space 27 does not reach either the chamber 12 or the chamber 13 whereby the corrugation 15 is extended over the top of the chamber 12, and the corrugations 16 are extended beneath the chamber 13,' as clearly shown in Fig. 5. These eXtensions provide greater relief' of expansion and contraction and strengthen the unitat the points where the flues join the chambers 12 and 13.

I do not desire to be restricted to the precise structure shown and described as many changes may be made within the scope of the appended claims.V

I claimj 1. A gas-heated hot-air heating unit cast in a single piece, comprising a combustion chamber, a vent chamber arranged above the combustion chamber and having an opening for waste gases, and flues connecting the chambers, the width of the flues being greater than the width of each chamber and forming transverse corrugations on the sides ofthe chan'ibers. l

Y2. A gas-heated hoteair heating unit cast in a fsingler piece, comprising a combustion chamber, a vent chamber arranged'above the combustion chamber and having an opening forwvaste gases, there being hollow correspending Ycorrugations projecting laterally from the chambers, and lues connecting the corresponding corrugations on the two chambers.

3. A gas-heated hot-air heating unit cast in a single piece, comprising a combustion chamberpa vent chamber arranged above the combustion chamber and having an opening for waste gases, there being hollow corresponding corrugationsprojecting laterally from the chambers, and flues lconnecting the corresponding corrugations on the two chambers, the corrugations'on the sides of the combustionfchambe'r being continued around the bottom thereof.

1.4. A gas-,heated hot-air heating unit cast in a` single piece, comprising acombustion chamber, a vent chamber arranged above the combustion chamber and having.4 an opening -for waste gases, and flues connecting the cha1nbers,the width of thei'lues being greater than t-he width-of each chamber and forming transverse corrugations on the sides of the chambers, each flue being divided into two vertical members. y

5. A gaseheated hot-air heating unit cast in a single piece, comprising a combustion chamber, avent chamber arranged vabove the combustion chamber and having an opening for waste gases, and iues connecting the chambers, the width of the iues being greater than the width of each chamber and forming transverse corrugations on the sides of the chambers, each flue being divided into 'two vertical members separated'to provide a space whereby air to be heated may contact with the opposing faces of the twoy members.

6. A gas-heated hot-air heating unit cast in va single piece, comprising a combustion chamber, a vent chamber arranged above the combustion chamber and having an opening for waste gases, and flues connecting the chambers, the width of the flues'being greater than the width of each chamber and forming transverse corrugations on the sides of the chambers, each Hue being divided into two vertical members, the cross section of the members converging away from each other.

7. A gas-heated hot-air heating unit cast in a single piece, comprising a combustion chamber, a vent chamber arranged above the combustion chamber and having an opening for waste gases, and Hues connecting the chambers, the width of the Hues being greater than the width of each chamber and forming transverse corrugatins on the sides of the chambers, each Hue being divided along the intermediate portion thereof to form two Hue members, each Hue being undivided adjacent to the two chambers and forming corrugations continuous with those on the chambers'.

In testimony whereof I hereunto affix my signature.

GEORGE FOSTER REZNOR. 

